The reason for adding 4 narrow columns to the right side of the agenda for every role (including Sargent at Arms, President, etc.) is that it helps the timer and each speaker as well. I have visited several clubs and many of them who prepare their own (non-Free ToastHost) agendas have narrow columns titled G, Y, R, STOP (or perhaps a stop symbol). For a 5-7 minute speech, the columns would be 5, 6, 7, 7:30; for a president's opening remarks, they might be 3, 3:30, 4, 4:30; and for a table topics speaker (one line, marked "timing for each speaker"), the columns would be 1, 1:30, 2, 2:30. The columns help a lot because they are "at-a-glance."
